The purpose of this study is to compare an online 12-module intervention designed to improve emotion regulation and social relations via mindfulness training with a 12-module program that provides information about health behaviors to individuals with fibromyalgia. The mindfulness training program is expected to produce greater day-to-day improvements than the education condition in individuals' efficacy for coping with pain and stress, positive and negative affect, and positive engagement in social relations assessed via online diaries completed each evening during the intervention period.